Bird feeder



FIG. 1 is a side and top perspective view of the bird feeder showing my new design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a front elevational view thereof; the rear and side elevational views being the same; and

FIG. 4 is a bottom plan view thereof. 

The ornamental design for a bird feeder, substantially as shown. 